package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;
import java.lang.reflect.Method;
import java.time.LocalDateTime;

/**
 * @Author: yuking
 * @Date: 2025/9/15 - 09 - 15 - 21:22
 * @Description: com.sky.aspect
 * @version: 1.0
 */
@Aspect
@Component
@Slf4j
public class AutoFillAspect {
/**
 * 切入点
 */
@Pointcut("execution(* com.sky.mapper.*.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
public void autoFillPointCut(){}

/**
 * 前置通知，在通知中进行公共字段的赋值
 */
@Before("autoFillPointCut()")
public void autoFill(JoinPoint joinPoint){
    log.info("开始进行公共字段自动填充...");

    //获取到当前被拦截的方法上的数据库操作类型
    MethodSignature signature = (MethodSignature) joinPoint.getSignature();//方法签名对象
    AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);//获得方法上的注解对象
    OperationType operationType = autoFill.value();//获得数据库操作类型

    //获取到当前被拦截的方法的参数--实体对象
    Object[] args = joinPoint.getArgs();
    if(args == null || args.length == 0){
        return;
    }

    Object entity = args[0];

    //准备赋值的数据
    LocalDateTime now = LocalDateTime.now();
    Long currentId = BaseContext.getCurrentId();

    //根据当前不同的操作类型，为对应的属性通过反射来赋值
    if(operationType == OperationType.INSERT){
        //为4个公共字段赋值
        try {
            Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
            Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
            Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
            Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

            //通过反射为对象属性赋值
            setCreateTime.invoke(entity,now);
            setCreateUser.invoke(entity,currentId);
            setUpdateTime.invoke(entity,now);
            setUpdateUser.invoke(entity,currentId);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }else if(operationType == OperationType.UPDATE){
        //为2个公共字段赋值
        try {
            Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
            Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

            //通过反射为对象属性赋值
            setUpdateTime.invoke(entity,now);
            setUpdateUser.invoke(entity,currentId);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
}
